From Starlog 1999:

William Shatner is a sweetheart. He loves to laugh. Not the stiff, forced Nimoy guffaw, but a man who sees the odd part of life. Humor is his friend. He seems to be poking fun at himself more than others. A very likable fellow. As the intellectual type, Leonard Nimoy was somewhat removed, much like his acting, although a decent man of conscience.

–Robert Brown, actor, interviewed by Duane S. Arnott: “Lazarus Rises Again”

Ganked from WeimarWorld.